(4) Characteristics
-Weight: approx. 96 kg
-
Maximum energy: 85 x 10 to the power 6 Joules
-
Maximum capacity: approx. 48 cubic centimeter
-Warning temperature: 300 deg.C (572.00 deg.F)
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K. Tachometer
(Ref. Fig. 034)
**ON A/C 001-049, 101-149, 151-199, 201-299,
(Ref. Fig. 035)
**ON A/C 051-099,
(Ref. Fig. 035A)
**ON A/C 301-399,
(Ref. Fig. 035B)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
Four identical tachometers are installed in the main-gear wheel axles
(one for each wheel).
The tachometers supply wheel speed information. Each tachometer has two
200-tooth rings:
-
1 stationary ring associated with a coil and a permanent magnet,
-
1 ring driven by the wheel.
The rotation of the wheel causes variations in the induction frequency
which are proportional to the angular speed (Frequency = 200 x angular
speed).
The variable-frequency voltage supplied by the tachometer is sent to the
Braking/Steering Control Unit.
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Tachometer
Figure 034
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Tachometer Installation
Figure 035
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Tachometer Installation
Figure 035A
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Tachometer Installation
Figure 035B
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L. Braking/Steering Control Unit (BSCU) The BSCU is installed in a 6MCU-size case in rack 90VU (Shelf 94VU). Its functions are:
-
Braking control through the servovalves and the pressure transducers,
-
Braking regulation through the check of the speed of each braked wheel,
-Integrated monitoring with memorization of the failures which come from the different LRUs of the system. It permits to locate the failures during maintenance operations, from the CFDS.
-Automatic braking control through the substitution of a programmed speed with a given acceleration rate to the anti-skid reference speed,
-Nosewheel steering control through a hydraulic block and an actuating cylinder (Ref. 32-50),
-Conversion into ARINC 429 data of the brake temperatures which come from the Brake Temperature Monitoring Units (BTMU) attached to the main landing gear.
All the functions use the digital technology.
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(1) Description of the BSCU (Ref. Fig. 036) The BSCU has:
-Four power supply units grouped two by two.
They form the sides of the case.
-An ARINC 600 connector at the back (Size 2, 300 contacts).
-A rear interface in the form of two U-shaped boards (around the connector). It comprises the lightning protection and the switching assemblies.
-Six electronic boards The dimensions of these boards are 225 x 175 mm. They are installed vertically and lengthwise in the case. They are connected together and to the rear interface through two connectors which occupy the totality of their back faces. There are two identical sets of three boards which form the systems 1 and 2. Each board with a microprocessor is connected to an On-Board Reprogrammable Module (OBRM) which includes PROMs.
The layout of the boards in the BSCU is shown in the referenced
figure.
(Ref. Fig. 037)
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BSCU
Figure 036
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BSCU Figure 036A
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BSCU - Internal Architecture
Figure 037
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